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| 4JH3-TE dies at idle, RPM problems. |
| Author |
Message |
    
Lorca Rossman
New member
Username: lorca
Post Number: 1
Registered: 11-2007
| | Posted on Thursday, November 08, 2007 - 10:24 pm: | 
|
Help! I have a Yanmar 4JH3-TE; 1997 but only 70 hours. Ran perfectly until a big trip in July; after 6 hours hard running it died when returned to idle; starting up would only get to 1800RPM,then after 5-10 minutes suddenly would get full power and happily go all day, only to die again whenever idled. Mechanic recommended diesel fuel conditioner at high concentration; tried without success; eventually pulled injector pump and had it rebuilt (all except hydraulic head); problems persisted on re-installation. Found a similar engine with a cracked block; installed its injector pump; worked fine on first trial, then identical problem. Swapped out inejctors; no improvement. Mechanic suggested fuel might be bad; today spent 4 hours discarding fuel, cleaning tanks (indeed dirty with gel-like layer on bottom), replaced dual Racor 10-micron primaries and yanmar secondary filters, flushed with brand-new diesel from busy gas station, primed lines to injectors.... ran motor directly from jerry-jug of fresh diesel; same problem. Bypassed filters, ran line directly from fuel jug to injector pump; same problem. I am stumped!!!! Any suggestions? |
Axel Brill
Visitor
| | Posted on Monday, June 02, 2008 - 10:35 pm: |
|
Hi,
have the same problem with my 4jh3-hte.
did you find a solution already? |
Lorca Rossman
New member
Username: lorca
Post Number: 2
Registered: 11-2007
| | Posted on Monday, June 02, 2008 - 11:44 pm: |
|
Yes, finally. Problem was the gummed-up injector pump. Biodiesel blend sitting for months had gummed everything up; stupidly I'd installed the rebuilt and then replacement injector pumps before changing out fuel/hoses etc and deep-cleaning fuel system. Ended up having original injector pump rebuilt again, though never needed it; while waiting for rebuild I disconnected fuel and injector lines from replacement pump and ran a few ounces of straight acetone through injector pump by turning it over with the starter (acetone had proved to rapidly dissolve the fuel-gum in the tank and lines); collected acetone in a jar. Followed this by Stanadyne, Marvel mystery oil and then clean diesel; finally reconnected everything and the engine has been trouble-free ever since.
Bottom line:
1) avoid biodiesel, especially if it's gonna sit
2) clean the entire fuel system, replace hoses etc before rebuilding the injector pump.
3) if bad fuel was the problem, consider running a solvent and fuel conditioner through the pump (but not into the engine) before resorting to rebuild.
Hope this helps you avoid my costly and stupid mistakes. |
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